/*
 * Famon (http://code.google.com/p/famon/)
 * Copyright (c) 2010 Carl Crous.
 *
 * This file is part of Famon.
 *
 * Famon is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Famon is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Famon.  If not, see <http://www.gnu.org/licenses/>.
 */

package za.org.foobar.famon.frontend.server.data;

import com.google.appengine.api.datastore.Key;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.gwtportlets.portlet.smartgwt.client.CriteriaDto;
import org.gwtportlets.portlet.smartgwt.client.DataTransferObject;
import org.gwtportlets.portlet.smartgwt.client.SmartPortletFactory;
import org.gwtportlets.portlet.smartgwt.server.DataProviderObject;
import org.gwtportlets.portlet.smartgwt.server.SmartFilter;
import za.org.foobar.famon.frontend.client.dto.UserDto;
import za.org.foobar.famon.frontend.server.ApplicationLogic;
import za.org.foobar.famon.frontend.server.UserLogic;
import za.org.foobar.famon.model.Application;
import za.org.foobar.famon.model.UserData;
import za.org.foobar.famon.util.DB;

import java.util.List;

/**
 *
 */
public class UserDpo implements DataProviderObject {
    private final Log log = LogFactory.getLog(getClass());

    public String getDataSourceId() {
        return UserDto.DATA_SOURCE_ID;
    }

    public List<DataTransferObject> fetchData(SmartPortletFactory f) {
        CriteriaDto criteria = f.getCriteria();
        log.info("Criteria:\n" + criteria);
        List<UserDto> list = getUserDtoList(f, criteria);
        if (list == null) {
            return null;
        }
        return f.limitList(list);
    }

    private List<UserDto> getUserDtoList(SmartPortletFactory f, CriteriaDto criteria) {
        UserLogic logic = UserLogic.get();
        if (criteria == null) {
            return logic.getUserDtoList();
        }
        // If an application ID was provided
        String applicationId = SmartFilter.getSimpleCriteriaValue(criteria, "applicationId");
        Application app = null;
        if (applicationId != null) {
            app = DB.find(Application.class, Application.stringToKey(applicationId));
        }
        String idString = SmartFilter.getSimpleCriteriaValue(criteria, "id");
        if (idString != null) {
            UserDto dto = logic.createUserDto(DB.find(UserData.class, UserData.stringToKey(idString)));
            if (app != null) {
                logic.setApplicationId(dto, app);
            }
            log.info("Got User: " + dto + " : " + (dto != null ? dto.email : ""));
            return f.singleResultList(dto);
        }
        if (app != null) {
            return logic.setApplicationId(logic.createUserDtoListFromApplicationUser(app.getUserList()), app);
        }
        return logic.getUserDtoList();
    }

    public DataTransferObject updateData(SmartPortletFactory f) {
        CriteriaDto criteria = f.getCriteria();
        log.info("Update: Criteria:\n" + criteria);
        return null;
    }

    public DataTransferObject addData(SmartPortletFactory f) {
        CriteriaDto criteria = f.getCriteria();
        log.info("Add: Criteria:\n" + criteria);
        return null;
    }

    public DataTransferObject removeData(SmartPortletFactory f) {
        CriteriaDto criteria = f.getCriteria();
        log.info("Remove: Criteria:\n" + criteria);
        UserDto userDto = (UserDto)f.getSingleDto();
        ApplicationLogic appLogic = ApplicationLogic.get();
        Key appKey = Application.stringToKey(userDto.applicationId);
        Key userKey = UserData.stringToKey(userDto.id);
        appLogic.deleteApplicationUser(appKey, userKey);
        return userDto;
    }
}
